Say and show
Say “show commands” to Dictation to see those suitable. In Finder, the Navigation group shows commands for moving focus. In TextEdit, it shows commands for selecting and moving in words and sentences.
Open System Preferences, click Dictation & Speech, and turn on Enhanced Dictation, so your Mac can interpret speech by itself. This requires a download hundreds of megabytes in size – the amount varies by language. Ensure the correct microphone is selected on the left.